Issue №: 2(121)
The journal deals with the problems of vibration technologies and machines, mathematical methods of vibration process studies, information on design and technological development, presents teaching and methodological aspects of teaching in the Higher School of Applied Sciences, where vibration machines and technologies are studied.
INFLUENCE OF THE TYPE OF CHIP FORMATION ON THE EXCITATION OF REGENERATIVE SELF-OSCIENCES DURING TURNING
Tryshyn Pavlo – Ph. D., Associate Professor of the Department of Mechanical Engineering Technology, National University “Zaporizhzhia Polytechnic”, Zaporizhzhia (69000, 64 Zhukovsky St., Zaporizhia, Ukraine, e-mail: trishin@zp.edu.ua), ORCID 0000-0002-3301-5124
Kozlova Olena – Ph. D., Associate Professor of the Department of Mechanical Engineering Technology, National University “Zaporizhzhia Polytechnic”, (69000, 64 Zhukovsky St., Zaporizhia, Ukraine, e-mail: kozlova@zp.edu.ua), ORCID 0000-0002-3478-5913.
Vnukov Yuriy - D.Sc.,Professor, Independent scientist, California, USA, e-mail: ypahar@ukr.net, ORCID: 0000-0002-4297-9646.
Levchenko Andriy - graduate student of the Department of Mechanical Engineering Technology, National University Zaporizhzhya Polytechnic, Zaporizhzhya, Ukraine, e-mail: andrey.levchenko.zp@gmail.com, ORCID: 0009-0006-3615-867X.
The paper presents the results of an experimental study of the influence of the type of chip formation on the occurrence and development of regenerative self-oscillations during turning. The relationship between the nature of chip formation and the dynamic stability of the technological system in the cutting process is considered. Experimental studies were conducted when processing various structural materials that differ in the mechanism of plastic deformation and the nature of chip formation.
It was established that when processing materials that form flowing chips, such as steel 45, copper M2, aluminum alloy D16 and lead C1, stable regenerative self-oscillations arise at certain ranges of cutting speeds. Their appearance is due to the relatively continuous nature of the plastic deformation of the material and the stable formation of the cut layer. Under these conditions, a positive feedback loop is formed between the change in the thickness of the cut layer and the oscillations of the elements of the technological system, which leads to the development of regenerative self-oscillations and a decrease in the stability of the cutting process.
At the same time, during the processing of materials characterized by segmental chip formation, regenerative self-oscillations were not observed. The periodic formation of chip segments with a certain frequency and the adiabatic nature of the displacement of these segments can lead to the damping of regenerative self-oscillations.
The results obtained show that the type of chip formation is one of the significant factors affecting the dynamic stability of the turning process. Confluent chip formation contributes to the emergence and development of regenerative self-oscillations, while segmental chip formation can completely suppress their development.
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About the journal
The journal "Vibrations in Engineering and Technologies" is included in the list of technical scientific publications of Ukraine
(Category "B", Order of the Ministry of Education and Science of Ukraine dated July 2, 2020 No. 886)
Old version of the site: http://vibrojournal.vsau.edu.ua/
The journal "Vibrations in Engineering and Technology" is indexed by the following databases and catalogs:
The certificateof massmedia State registration:kv no 16643-5115 from 30.04.2010 .
Founder of the journal: Vinnytsia National Agrarian University
The journal is devoted to highlighting current issues in engineering, mechanical engineering, and technological processes, including the study of dynamic and oscillatory phenomena in technical systems, the application of mathematical methods for process modeling and analysis, as well as the presentation of results of design-engineering and technological developments. Particular attention is given to the study of vibration processes and their application in modern technologies.
The purpose of the scientific journal “Vibrations in Engineering and Technologies” is to disseminate the results of fundamental and applied research in the field of engineering sciences aimed at developing theoretical foundations and practical approaches to the design, analysis, and improvement of machines, materials, and technological processes, including the use of vibration and oscillatory effects in various sectors of production.
The publication is focused on the formation of a modern scientific and informational environment for the effective exchange of research results, support of innovative development, and implementation of advanced technical solutions in industry, agro-industrial production, and related fields.
The journal promotes the development of interdisciplinary research, the integration of modern engineering approaches, and the enhancement of the efficiency of technological processes and technical systems, including through the rational use of vibration phenomena.
Objectives of the Scientific Journal
To achieve its stated purpose, the journal addresses the following key objectives:
dissemination of results of fundamental and applied scientific research in the fields of mechanics, mechanical engineering, technological processes, machine dynamics, and equipment, as well as in areas related to the application of vibration phenomena in engineering and technologies;
promotion of research aimed at the creation and improvement of machines, mechanisms, and technological equipment based on oscillatory and vibration processes;
support for the implementation of modern technological solutions focused on improving productivity, energy efficiency, and reliability of technical systems;
обеспечение scientific exchange of research results among research institutions, higher education establishments, and industrial enterprises;
development of interdisciplinary cooperation among researchers in the fields of mechanics, materials science, material processing technologies, and automation of technological processes;
dissemination of modern scientific achievements and advanced technologies related to the application of vibration processes in production and technical systems.
Publisher Vinnytsia National Agrarian University
In June 1994 the 2nd International Scientific and Technical Conference "Application of vibrations for technological purposes" was organized on the basis of Vinnytsia State Agricultural Institute. Leading experts in this field, noting the significant contribution to the school of Vibration Engineering under the leadership of P. S. Bernyk, proposed to create a professional all-Ukrainian scientific and technical journal "Vibration in engineering and technology..The journal was foundedat Vinnytsia State Agricultural Institute and P.S. Bernyk was elected to be the chief editor .
For all these years (since 1994) theJournal "vibration in engineering and technology" published 119 issues wherestudy of vibration effects, the creation of progressive energy saving technologies and equipment for their implementation were highlighted.
Currently Ihor Kupchuk, Candidate of Technical Sciences, Associate professor, Associate Professor of the Department of Engineering Mechanics and Technological Processes in the Agricultural Industry Faculty of Engineering and Technology Vinnytsia National Agrarian University is the chief editor of the "Vibrations in engineering and Technology"
The journal "Vibration in Engineering and technology", which has no analogues on the territory of Ukraine, is well known abroad.
